Steroid releasing vaginal rings.
D002986:Clinical Trials as Topic; D003274:Contraceptive Devices, Female / Q000009:adverse effects; D005260:Female; D006801:Humans; D016912:Levonorgestrel; D008525:Medroxyprogesterone / Q000008:administration & dosage; D009640:Norethindrone / Q000008:administration & dosage; D009644:Norgestrel / Q000008:administration & dosage; D010060:Ovulation / Q000187:drug effects; D010342:Patient Acceptance of Health Care; D011374:Progesterone / Q000008:administration & dosage; D011372:Progestins / Q000008:administration & dosage*
D011372:Progestins; D009644:Norgestrel; D011374:Progesterone; D016912:Levonorgestrel; D008525:Medroxyprogesterone; D009640:Norethindrone